Metal finishing and processing

Enzminger, J.D.

doi:10.1002/j.1554-7531.1994.tb00111.x

Water Environment Research

1994

DOI: 10.1002/j.1554-7531.1994.tb00111.x

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Metal finishing and processing

J.D. Enzminger¹

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2000

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Treatment of Acid Pickling Baths by Means of Anionic Resins

Marañón

Fernández

Suárez

et al. 2000

Ind. Eng. Chem. Res.

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This paper is a study of the use of two anionic ion-exchange resins, Lewatit MP-500 and Lewatit M-504, to remove iron and zinc from acid pickling baths employed in the galvanizing process. Ion-exchange assays were carried out with HCl baths containing Zn(II) and Fe(III), obtained after oxidation with H 2 O 2 , both of which are present in the form of chloro complexes. The breakthrough curves obtained demonstrate that both resins exhibit a greater capacity for Zn. Two alternatives were studied, employing one column (simultaneous removal of Zn and Fe) or two columns in series (sequential removal) with the aim of designing the most adequate treatment process. A series of pilot-plant-scale assays were carried out that verified the reproducibility of the results obtained in the laboratory. The retained metals were eluted with water, with 3 bed volumes (BV) being needed for iron and greater amounts, 6 BV, for zinc. However, when 12% NH 4 OH is used, the elution of Zn is achieved with only 2 BV. In both cases, decomposition of the retained chloro complexes took place, releasing ZnCl 2 and FeCl 3 ; the resins then dissociated to the chloride form, ready to be used again.

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Treatment of Acid Pickling Baths by Means of Anionic Resins

Marañón

Fernández

Suárez

et al. 2000

Ind. Eng. Chem. Res.

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Metal finishing and processing

Cited by 1 publication

References 19 publications

Treatment of Acid Pickling Baths by Means of Anionic Resins

Treatment of Acid Pickling Baths by Means of Anionic Resins

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